Hasegawa Yasuhisa, Abe Chie, Ikeda Ayumi
National Institute of Advanced Industrial Science and Technology (AIST), Research Institute of Chemical Process Technology, 4-2-1 Nigatake, Sendai 983-8551, Japan.
Membranes (Basel). 2021 Mar 23;11(3):229. doi: 10.3390/membranes11030229.
A high-silica chabazite (CHA) type zeolite membrane was prepared on the porous α-AlO support tube by the secondary growth of seed particles. The dehydration performances of the membrane were determined using methanol, ethanol, 2-propanol, acetone, acetic acid, methyl ethyl ketone (MEK), tetrahydrofuran (THF), -dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and -methyl-2-pyrolidone (NMP) at 303-373 K. As a result, the dehydration performances of the membrane were categorized to following three types: (1) 2-propanol, acetone, THF, and MEK; (2) ethanol and acetic acid; and (3) methanol, DMF, and DMSO, and NMP. The adsorption isotherms of water, methanol, ethanol, and 2-propanol were determined to discuss the influences of the organic solvents on the permeation and separation performances of the membrane. For 2-propanol, acetone, MEK, and THF solutions, the high permeation fluxes and separation factors were obtained because of the preferential adsorption of water due to molecular sieving. In contrast, the permeation fluxes and separation factors were relatively low for methanol, DMF, and DMSO, and NMP solutions. The lower dehydration performance for the methanol solution was due to the adsorption of methanol. The permeation fluxes for ethanol and acetic acid solution were ca. 1 kg m h. The significantly low flux was attributed to the similar molecular diameter to the micropore size of CHA-type zeolite.
通过种子颗粒的二次生长，在多孔α-AlO支撑管上制备了一种高硅菱沸石（CHA）型沸石膜。在303 - 373 K下，使用甲醇、乙醇、2-丙醇、丙酮、乙酸、甲乙酮（MEK）、四氢呋喃（THF）、二甲基甲酰胺（DMF）、二甲基亚砜（DMSO）和N-甲基-2-吡咯烷酮（NMP）测定了该膜的脱水性能。结果，该膜的脱水性能分为以下三种类型：（1）2-丙醇、丙酮、THF和MEK；（2）乙醇和乙酸；（3）甲醇、DMF、DMSO和NMP。测定了水、甲醇、乙醇和2-丙醇的吸附等温线，以讨论有机溶剂对膜渗透和分离性能的影响。对于2-丙醇、丙酮、MEK和THF溶液，由于分子筛作用对水的优先吸附，获得了高渗透通量和分离因子。相反，甲醇、DMF、DMSO和NMP溶液的渗透通量和分离因子相对较低。甲醇溶液脱水性能较低是由于甲醇的吸附。乙醇和乙酸溶液的渗透通量约为1 kg m⁻² h⁻¹。通量显著较低归因于其分子直径与CHA型沸石微孔尺寸相似。
